This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

1edy

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 09:36, 21 July 2021

CRYSTAL STRUCTURE OF RAT ALPHA 1-MACROGLOBULIN RECEPTOR BINDING DOMAIN

Structural highlights

1edy is a 2 chain structure with sequence from Buffalo rat. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[A1M_RAT] Is able to inhibit all four classes of proteinases by a unique 'trapping' mechanism. This protein has a peptide stretch, called the 'bait region' which contains specific cleavage sites for different proteinases. When a proteinase cleaves the bait region, a conformational change is induced in the protein which traps the proteinase. The entrapped enzyme remains active against low molecular weight substrates (activity against high molecular weight substrates is greatly reduced). Following cleavage in the bait region a thioester bond is hydrolyzed and mediates the covalent binding of the protein to the proteinase (By similarity).[UniProtKB:P01023]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Alpha-macroglobulin inhibits a broad spectrum of proteinases by forming macromolecular cages inside which proteinases are cross-linked and trapped. Upon formation of a complex with proteinase, alpha-macroglobulin undergoes a large conformational change that results in the exposure of its receptor-binding domain (RBD). Engagement of this domain by alpha-macroglobulin receptor permits clearance of the alpha-macroglobulin: proteinase complex from circulation. The crystal structure of rat alpha1-macroglobulin RBD has been determined at 2.3 A resolution. The RBD is composed of a nine-stranded beta-sandwich and a single alpha-helix that has been implicated as part of the receptor binding site and that lies on the surface of the beta-sandwich. The crystallographic asymmetric unit contains a dimer of RBDs related by approximate twofold symmetry such that the putative receptor recognition sites of the two monomers are contiguous. By gel filtration and ultracentrifugation, it is shown that RBD dimers form in solution with a dissociation constant of approximately 50 microM. The structure of the RBD dimer might mimic a conformation of transformed alpha-macroglobulin in which the proposed receptor binding residues are exposed on one face of the dimer. A pair of phenylalanine residues replaces a cystine that is conserved in other members of the macroglobulin family. These residues participate in a network of aromatic side-chain interactions that appears to stabilize the dimer interface.

Structure of a rat alpha 1-macroglobulin receptor-binding domain dimer.,Xiao T, DeCamp DL, Spran SR Protein Sci. 2000 Oct;9(10):1889-97. PMID:11106161^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Xiao T, DeCamp DL, Spran SR. Structure of a rat alpha 1-macroglobulin receptor-binding domain dimer. Protein Sci. 2000 Oct;9(10):1889-97. PMID:11106161

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1edy"

@@ Line 3: / Line 3: @@
 <StructureSection load='1edy' size='340' side='right'caption='[[1edy]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[1edy]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Buffalo_rat Buffalo rat]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EDY OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1EDY FirstGlance]. <br>
+<table><tr><td colspan='2'>[[1edy]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Buffalo_rat Buffalo rat]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EDY OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EDY FirstGlance]. <br>
-</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1edy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1edy OCA], [http://pdbe.org/1edy PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1edy RCSB], [http://www.ebi.ac.uk/pdbsum/1edy PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1edy ProSAT]</span></td></tr>
+</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1edy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1edy OCA], [https://pdbe.org/1edy PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1edy RCSB], [https://www.ebi.ac.uk/pdbsum/1edy PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1edy ProSAT]</span></td></tr>
 </table>
 == Function ==
-[[http://www.uniprot.org/uniprot/A1M_RAT A1M_RAT]] Is able to inhibit all four classes of proteinases by a unique 'trapping' mechanism. This protein has a peptide stretch, called the 'bait region' which contains specific cleavage sites for different proteinases. When a proteinase cleaves the bait region, a conformational change is induced in the protein which traps the proteinase. The entrapped enzyme remains active against low molecular weight substrates (activity against high molecular weight substrates is greatly reduced). Following cleavage in the bait region a thioester bond is hydrolyzed and mediates the covalent binding of the protein to the proteinase (By similarity).[UniProtKB:P01023]
+[[https://www.uniprot.org/uniprot/A1M_RAT A1M_RAT]] Is able to inhibit all four classes of proteinases by a unique 'trapping' mechanism. This protein has a peptide stretch, called the 'bait region' which contains specific cleavage sites for different proteinases. When a proteinase cleaves the bait region, a conformational change is induced in the protein which traps the proteinase. The entrapped enzyme remains active against low molecular weight substrates (activity against high molecular weight substrates is greatly reduced). Following cleavage in the bait region a thioester bond is hydrolyzed and mediates the covalent binding of the protein to the proteinase (By similarity).[UniProtKB:P01023]
 == Evolutionary Conservation ==
 [[Image:Consurf_key_small.gif|200px|right]]

1edy

From Proteopedia

Revision as of 09:36, 21 July 2021

CRYSTAL STRUCTURE OF RAT ALPHA 1-MACROGLOBULIN RECEPTOR BINDING DOMAIN

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox